Lois Riess' Son, Braden Riess, Says She Was a 'Good Lady' But 'Had Her Own Demons Lately'

Lois Riess' son says he's stunned she's been accused of killing two people — including his father — and claims she was a "good lady."

"It's unbelievable," Braden Riess, 30, told Inside Edition in an exclusive interview that will air in full Thursday. "I can't wrap my head around it. My mom was a good lady."

Riess, a grandmother, is accused of killing her husband, David, in Minnesota in March before heading to Florida, where she befriended a woman who looked like her. She then allegedly killed the woman, 59-year-old Pamela Hutchinson, and stole her identity.

Authorities eventually caught up with Riess — who published reports dubbed the "killer grandma" — in Texas and extradited her back to Florida, where she remains.

Braden, her youngest son, said she'd struggled with a gambling addiction before her alleged crimes.

"She had her own demons, you know, lately," he said. "Something happened in her brain that made her snap."